We are going into week 3 of the introduction of our 13 week old kitten to our 1 year old resident cat. We’ve successfully navigated scent transfer, site swapping, visual meeting through a mesh gate and have now begun brief face to face meetings. It’s going well, our 1 year old is super excited to play with the kitten, he chirps and tries to get the kitten to chase him. After 3-4 minutes of mutual chasing and tackling it seems the older cat starts to get a bit over stimulated and gets a bit rough with the kitten. No hissing, growling or claws or anything just more aggressive tackling and pinning the kitten down. How do I proceed with this to make the interactions more level? I’ve tried mutual play with each cat separately but they have no interest in anything but each other when they are together. When I separate them and put the kitten back in his base camp room they cry for each other on either side of the door. Any tips would be greatly appreciated